Learning BGP multihoming and anycasting, where to obtain IPv6 assignment?

I'm currently trying to build a simple multihomed network, and I was wondering if anyone knows of a good place to obtain roughly a /46 or /47 cheaply, as I'm on a relatively tight budget. I plan to expand this to add some anycasting with multiple PoPs, which is why I need more than a /48 (I need at least a /48 for non-anycasted, one for anycasted).

​

I'm in the RIPE region, and everything I've been able to find seems really over-priced (200 euros per year for a /48, for example.)

​

Thanks in advance.